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• 22 = SSH (Secure Shell) - log into a Linux instance
• 21 = FTP (File Transfer Protocol) – upload files into a file share
• 22 = SFTP (Secure File Transfer Protocol) – upload files using SSH
• 80 = HTTP – access unsecured websites
• 443 = HTTPS – access secured websites
• 3389 = RDP (Remote Desktop Protocol) – log into a Windows instance
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